Operator supporting arrangement



Nov. 7, 1961 w. DARANDlK OPERATOR SUPPORTING ARRANGEMENT Filed May 25, 1959 7 Sheets-Sheet 1 2 Fig. 7

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I OPERATOR SUPPORTING ARRANGEMENT Filed May 25, 1959 7 Sheets-Sheet 2 Nov. 7, 1961 w. DARANDIK 390WA25 OPERATOR SUPPORTING ARRANGEMENT Filed May 25, 1959 7 Sheets-Sheet 3 l 2 Fig. 3

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OPERATOR SUPPORTING ARRANGEMENT Filed May 25, 1959 '7 Sheets-Sheet 4 Nov. 7, 1961 w. DARANDIK 3,007,423?

OPERATOR SUPPORTING ARRANGEMENT Filed May 25, 1959 7 Sheets-Sheet 5 Nov. 7, 1961 w. DARANDIK 3,007,425

OPERATOR SUPPORTING ARRANGEMENT Filed May 25, 1959 7 Sheets-Sheet 6 Nv. 7, 1961 w. DARANDIK 3,007,425

OPERATOR SUPPORTING ARRANGEMENT Filed May 25, 1959 7 Sheets-Sheet 7 United States Patent M 3,007,425 OPERATOR SUPPORTING ARRANGEMENT WilhelmDarandik, Hamburg, Germany, assignor of onehalf to Kettma Hamburger Kettelmaschinenfabrik Erich Hahn K.G., Hamburg, Germany Filed May 25, 1959, 'Ser. No. 815,450 Claims priority, application Germany May 23, 1958 14 Claims. (Cl. 112-25) The present invention relates to an operater supporting arrangement for a circular linking machine of the type described in my US. Patent 2,862,464, issued December 2, 1958, and in my copending application Serial No. 777,050, filed November 28, 1958. In linking machines of the type to which the present invention relates, two pieces of knitted material are placed with their loops on a circle of needles and thereupon linked or sewn to each other. The circle of needles rotates on a turnable member which is coaxial with the circle of needles, and the operator attaches the knitted pieces to the section of the circle of needles which passes her. If the operator works faster, or slower, than required by the speed of the needles, the portion of the circle of needles where the operator works is not directly in front of her. In this event, the operator turns the turnable supporting body on which the circle of needles is mounted, until a desired section of a circle of needles is in front of her.

The supporting body is preferably a vertical column which can be turned through an angle of 360 during operation of the machine.

It is, however, necessary that two, and sometimes even three operators, work on the same machine. The first operator sits on a stationary seat, and turns the machine into the most convenient position, as explained above.

The second operator may work on a part of the circle of needles which is located diametrically opposite the first operator. As the first operator turns the supporting body with the machine, the second operator cannot properly perform the necessary operations, since the needles move while the needle ring is moved under control of the first operator, while the second operator tries to perform other operations. The rotary speed of the turning movement of the machine, determined by the first operator, may be inconvenient for the second operator.

It is the object of the present invention to overcome this disadvantage of the circular linking machines of this type, and to provide a circular linking machine at which more than one operator can conveniently work.

Another object of the present invention is to provide a circular linking machine which is turned by one operator into the most convenient position, while another operator turns with the machine, and consequently remains oposite the same part of the machine irrespective of the turning movement of the same.

Another object of the present invention is to mount an operator supporting means on the turnable supporting body of a machine, so that when the turnable supporting body is turned by an operator, another operator sitting on the seat remains in the same position relative to the machine.

It is consequently the principal object of the present invention to attach an operator supporting means to the turnable supporting body of a machine which has a circular operational area so that when one operator turns the supporting body into a desired position, another operator supported on the operator supporting means remains opposite the same section of the circular operational area.

It is also an object of the present invention to provide a turnably mounted machine on which'more than one operator can efficiently work.

A further object of the present invention is to prevent that in the above described arrangement the second operator is turned into a position interfering with the first operator.

With these objects in view, the present inventionmainly consists in an operator supporting arrangement which comprises, in combination, a stationary, support; a machine, for example a circular linking machine, including a supporting body, such as a column, mounted on the stationary support for turning movement about a vertical axis; and operator supporting means, such as a seat, attached to the turnable supporting body. The machine has a circular operational area, such as a circle of needles, concentric with the vertical axis of the supporting body, and being turnable with the supporting body. In this manner, any desired position of the circular operational area can be turned by a first operator into a selected working position by turning the supporting body. At the same time, a second operator seated on the operator supporting means, turns with the supporting body and consequently remains opposite the same portion of the circular operational area regardless of the angular displace ment of the operational area effected by the first operator.

The attachment of the operator supporting means is preferably effected by a coupling means controlled by the second operator. machine into a position in which the seat with the second operator interfers with her, the second operator releases the coupling, so that the operator supporting seat does not turn with the machine. Of course, this means that the desiredportion of the operational area moves away from the second operator, but this is only temporary, since normally thework of both operators can be simultaneouly carried out.

In one embodiment of the present invention, a seat for the second operator is partly turnably supported on the.

stationary support of the machine, and partly, supported on a wheel means rolling on the floor around the machine. In another embodiment of. the present invention, .the seat for the second operator is fully supported onthe station-.

ary support of the machine for turningmovement above.

the vertical axis of the machine, and is attached by c0u-. pling means to the turnable supporting body of the machine, whenever desired by the second operator. The coupling means may be manually operated, orprovided with a foot pedal.

The seat for the second operator may be turnable through 360 about the axis of the machine, but since the second operator generally does not needaccess tothe entire operational. area, in other words to all. needles of the needle ring-of the machine, a turning movement of.

the seat may be limited to an angle between 45 and 300,ifso. desired.

Thenovel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its-method of operation, to gether with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings in which:

FIG. 1 is-a perspective view illustrating one embodiment of the present invention in which the operator'supporting seat is turnable through an angle of 45;

FIG. 1a is a vertical. sectional'view of a detail of the arrangementshown in FIG. 1 along line. aa of FIG. 1;

FIG. 2 is a horizontal sectional view taken on line IIII in FIG. 1;

FIG. 3 is a perspective view illustrating a modified arrangement of the machine in which the operator supporting seat is turnable through 360 about the axis of the machine;

FIG. 3a is a vertical sectional viewillustrating a detail Patented Nov. 7, 1961 When the first operator turns the.

of the arrangement shown in FIG. 3 along line a-a of FIG. 3;

FIG. 4 is a horizontal sectional view taken on line IV-IV in FIG. 3;

FIG. 5 is a perspective view of another embodiment of the present invention;

FIG. 6 is a fragmentary side elevation, partly in section, illustrating a detail of the embodiment of FIG. 5 on a larger scale;

FIG. 7 is a horizontal sectional view taken on line FIG. 8 is a fragmentary sectional elevation illustrating a coupling means used in the embodiment of FIG. 5; and

FIG. 9 is a fragmentary plan view of the device shown in FIG. 8.

Referring now to the drawings, and more particularly to the embodiment of the present invention illustrated in FIG. 1, the circular linking machine shown therein is of the type disclosed in my U.S. Patent 2,862,464. On a stationary support 4, a supporting body including a vertical column 1 and a circular flange 5 is mounted for turning movement about a vertical axis. On top of the column 1, a needle ring 3 is mounted for turning movement relative to column 1 about the vertical axis of column 1, and moves along a circular path, when driven. However, when column 1 is turned, needle ring 3 turns with column 1. A vertical support 2 is fixedly connected to column 1 for turning movement with the same, and has a projecting arm provided with a reciprocating needle means 20 cooperating with needle ring 3.

In the arrangement illustrated in FIG. 1, a first operator may be seated on a seat, not shown, on the left of the machine, and have feet on the flange 5 for turning the supporting body 1, 5 in the manner of a potters wheel. The drive means for the needle ring and for needle 2a are started and stopped by operation of the foot pedal 5a. As the needle ring 3 passes the operator, she can turn column 1 with the needle ring into a position in which a desired portion of needle ring 3 is located opposite her.

In accordance with the present invention, an operator supporting seat 6 for a second operator is provided. Seat 6 has a telescopic rod 6a located in a sleeve 25 and adjustable therein. A leg means 7 is secured to the sleeve 25, and has a wheel 8 thereon which rolls on the floor surrounding the machine, or on a suitable circular track, which is concentric with the vertical axis of the machine. The track may be provided on a plate which forms part of the stationary support 4. The seat 6 has two leg means 9 and 10 which are supported on the flange 5. Members 9a and 10a are secured to the free ends of the leg means 9 and 10 and to a part circular member 11 which is freely slidable in a circular slot 11a, see FIG. la, so that the seat 6 may remain in place, while the supporting body 1, 5 turns. The length of the circular slot 11a permits a relative turning movement through an angle of 45".

A friction coupling means 13 is mounted on leg means 9 and 10, and is urged by springs 14 into a coupling position engaging flange 5. The friction coupling means 13 has a foot pedal 15 which can be operated by an operator seated on seat 6.

The machine is operated in the following manner: A first operator seated on the left as viewed in FIG. 1 operates on the needle supporting ring 3, and turns the machine into the most convenient position by pushing flange 5 with her feet. A second operator is seated on seat 6, and also works on the needle ring 3. As long as the coupling means 13 is in coupling position under the action of spring 14, seat 6 will turn with the machine, so that the second operator remains opposite the same portion of the circular operational area of the machine, as represented by the needle ring 3. When the machine is turned through an angle greater than 45, or into a position which appears undesirable to the second operator seated on seat 6, the second operator operates the foot pedal 15, and releases the friction coupling, so that seat 6 will not turn with the machine. A relative angular displacement of 45 is in many cases suflicient, since the adjusting turning movements of the machine effected by the first operator extends through a corresponding angle.

However, under certain operational conditions, turning of operator supporting seat 6 through a greater angle may be desired.

In the embodiment of FIGS. 3 and 4, seat 6 may remain stationary while the machine turns through 360. Member 12, corresponding to the member 11 of FIG. 1, is circular in the embodiment of FIG. 3, and secured to legs 9 and 10. The machine is provided with a circular guide slot 12a for ring member 12. The machine is operated as described with respect to the embodiment of FIGS. 1 and 2. When the operator on seat 6 effects coupling of the coupling means 13, seat 6 turns with flange 5, column 1 and the entire machine. When the operator releases the coupling by operation of foot pedal 15, seat 6 will not turn with the machine, but may remain in the same place due to the friction caused by the weight of the operator, or the operator may hold on to a stationary element so that the friction between the ring member 12 and the track 12a cannot take along seat 6. During normal operational conditions, seat 6 will be coupled to the machine, and will be turned by the first operator, so that the second operator on seat 6 can continue working on the same section of the operational area 3. When during such turning movement, seat 6 moves so far as to interfere with the first operator, the second operator releases the coupling, so that seat 6 will not turn with the turnable supporting body 1, 5.

A modified embodiment of this type is illustrated in FIGS. 5, 6 and 7.

The machine illustrated in FIGS. 5-7 is of the same type as described with reference to FIGS. 1 to 4. The supporting column 1 can be turned by an operator by applying pressure to the flange 5, and such turning movement effects turning of the support 2 with reciprocating needle 2a while needle ring 3 rotates about the smooth circular plate 3a, when driven. Supporting body 1, 5 can be turned by the operator through more than 360.

In accordance with the present invention, an operator supporting means is provided which includes a connecting portion 24, and a telescopic adjustable post including a sleeve 25 and a rod 6a. An arm 26 is fixed to sleeve 25 and carries at the free end thereof a coupling means 113 which is shown in detail in FIGS. 8 and 9. Coupling means 113 includes a casing 27 fixed to arm 26, and a coupling member 28, 29, 30 which is vertically movably mounted in casing 27, and is urged by a spring 2% to normally remain in a coupling position in which the friction surface 29a of the friction disc 29 engages the top surface of flange 5. A pair of foot pedals is provided which include levers 31, 32 pivotally mounted on pivot means 27a and 27b on casing 27. The ends of levers 31 and 32 cooperate with the plate 30 for moving the coupling member to an inoperative position in which the friction surface 29a is spaced from the top surface of flange 5.

When coupling means 113 is in coupling position, operator supporting means 24, 25, 26 and 6 is taken along by the turning supporting body 1, 5. In the embodiment of FIGS. 5 to 7, the operator supporting means is fully supported on the machine, as best seen in FIG. 6. The supporting body, and more particularly the flange 5 carries a plurality of radial arms 17 on which wheels 16 are mounted. Wheels 16 roll on the stationary support plate 4 when the supporting body 1, 5 is turned about its vertical axis. A plurality of radial bars 19 is secured to base plate 4 by bolts, and bars 19 project beyond flange 5. A stationary ring 22 including an inner flange, and a circular vertical wall, is fixedly secured by bolts to bars 19. Another stationary ring 21 is secured by bolts 20 to the radial bars 19, and surrounds flange 5 spaced from the same. The top surface of the stationary ring 21 is slightly lower than the-top surface of flange 5. The circular bottom face 21a of stationary ring 21 de fines a circular gap with the upper face of a rotary supporting ring 23. This supporting ring 23 has a vertical ring portion, and a horizontal circular flange projecting through the annular gap between the stationary rings 21 and 22. Preferably balls 2312 are arranged between the outer circular surface of ring 23, and the inner circular surface of stationary ring 22, so that ring 23 can rotate relative to ring 22 about the vertical axis of the supporting body 1, with which rings 23 and 22 are concentric.

As shown in FIGS. 5, 6 and 7, the connecting portion 24 of the operator supporting means is bolted to the flange of ring 23. The connecting bolt 33 is secured to the arm 26 which carries coupling means 113 to increase rigidity of the construction. Two leg portions are secured to sleeve 25 and are fixedly secured to the outer flange of member 23.

in this manner, seat 6 is fully supported on the stationary supporting means 4, 19, 22 of the machine for turning movement relative to the supporting body 1, 5.

Preferably, a roller 34 is mounted on the stationary ring 21 diametrically opposite connecting portion 24- of the operator supporting means, and engages the circular upper face of the rotary supporting ring 23. The axis of roller 34 is radial and horizontal, so that ring 23 cannot be tilted by the weight of the operator on seat 6. In this manner, the operator supporting means are fully supported on the machine without requiring an additional wheel means as described with reference to FIGS. 1 and 3. When a first operator turns the entire machine by applying foot pressure to flange 5, the seat 6 is taken along when coupling means 113 is in coupling position. A turning of the seat through 360 is possible, so that the operator on seat 6 remains opposite the same portion of the needle ring 3 regardless to which extent the first operator turns the machine.

However, when the seat 6 tends to interfere with the first operator, the second operator operates a foot pedal to release the coupling means 113, so that ring 23 can turn relative to ring 22 permitting seat '6 to remain stationary While the first operator turns the machine. The operator on seat 6 may place her feet on the stationary ring 21, so that the seat 6 will not follow the turning movement of the supporting body 1, 5 due to friction between rings 22 and 23, and balls 23b. It is evident that such friction is very small, so that any contact of the operator on seat 6 with a stationary element will be sufficient to prevent turning movement of seat 6 with the machine when the coupling member 29 is retracted from the top surface of flange 5.

As compared with the embodiment of 'FlGS. 5 to 7, the embodiments of FIGS. 1 and 3 have the disadvantage that the wheel 8 may encounter considerable friction and resistance against roll-ing so that a greater effort is required from the first operator to turn the machine.

The arrangement of the present invention, may also be advantageously applied to the machines disclosed in my copending application Serial No. 777,050, filed November 28, 1958, disclosing embodiments in which the machine is turnable on a stationary column. In construction of this type, the coupling means for the operator supporting means is located opposite the respective turnable supporting body of the machine, and is coupled to the same. Since in such an arrangement the coupling means is located on a higher level, it may be manually operated by the second operator.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of machines turning about a vertical axis differing from the types described above.

While the invention has been illustrated and described as embodied in an operator supporting arrangement for a circular upright linking machine, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any Way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be secured by Letters Patent is:

1. In a circular linking machine, an operator supporting arrangement comprising, in combination, a stationary support; a supporting body mounted on said stationary support for turning movement about a vertical axis; circular tool means concentric with said vertical axis and turnable with said supporting body so that any desired portion of said tool means can be turned by a first operator into a selected Working position by effecting turning movement of said supporting body; and operator supporting means for a second operator, said operator supporting means attached to said turnable supporting body so that said operator supporting means turns with said supporting body whereby the second operator remains opposite the same portion of said tool means when the first operator turns said supporting body to work on different portions of said tool means.

2. In a circular linking machine, an operator supporting arrangement comprising, in combination, a stationary support; a supporting body mounted on Said stationary support for turning movement about a vertical axis; a circular needle ring concentric with said vertical axis and turnable with said supporting body so that any desired portion of said needle ring can be turned by a first operator into a selected working position by eifecting turning movement of said supporting body; operator supporting means for a second operator, said operator. supporting means including a connecting portion connected to said support for turning movement relative to the same about said vertical axis, and a support portion for the second operator secured to said connecting portion; and operator controlled coupling means for coupling said connecting portion to said turnable supporting body so that said operator supporting means turns with said supporting body whereby the second operator remains opposite the same portion of said needle ring when the first operator turns said supporting body to work on different portions of said needle ring.

3. in a circular linking machine, an operator supporting arrangement comprising, in combination, a stationary support; a supporting body mounted on said stationary support for turning movement about a vertical axis; a circular needle ring concentric with said vertical axis and turnable with said supporting body so that any desired portion of said needle ring can be turned by a first operator into a selected working position by effecting turning movement of said supporting body; operator supporting means for a second operator, said operator supporting means including a connecting portion connected to said support for turning movement relative to the same about said vertical axis, and a support portion for the second operator secured to said connecting portion; and operator controlled coupling means including a casing secured to said connecting portion, a movable coupling member having a friction surface and mounted in said casing for movement to and from a coupling position in which said friction surface frictionally engages said'turnable supporting body for coupling said operator support means to said turnable supporting body for turning movement with the same, and operator influenced means for movingsaid coupling member to and from said coupling position so that said operator supporting means turns with said sup- 7 porting body when said coupling means is in said coupling position whereby the second operator remains opposite the same portions of said needle ring when the first operator turns said supporting body to work on dilferent portions of said needle ring.

4. In a circular linking machine, an operator supporting arrangement comprising, in combination, a stationary support; a supporting body mounted on said stationary support for turning movement about a vertical axis; a circular needle ring concentric with said vertical axis and turnable with said supporting body so that any desired portion of said needle ring can be turned by a first operator into a selected working position by effecting turning movement of said supporting body; operator supporting means for a second operator, said operator supporting means including a connecting portion connected to said support for turning movement relative to the same about said vertical axis, and a support portion for the second operator secured to said connecting portion; and operator controlled coupling means including a casing secured to said connecting portion, a movable coupling member having a friction surface and mounted in said casing for movement to and from a coupling position in which said friction surface frictionally engages said turnable supporting body for coupling said operator support means to said turnable supporting body for turning movement with the same, spring means in said casing for urging said coupling member to said coupling position, and operator influenced means for moving said coupling member from said coupling position, said operator supporting means turning with said supporting body when said coupling means is in said coupling position whereby the second operator remains opposite the same portion of said needle ring when the first operator turns said supporting body to work on different portions of said needle ring.

5. An arrangement as set forth in claim 4, wherein said operator influenced means includes at least one foot pedal secured to said supporting portion of said operator supporting means below said support portion.

6. In a circular linking machine, an operator supporting arrangement comprising, in combination, a stationary support; a supporting body mounted on said stationary support for turning movement about a vertical axis; a circular needle ring concentric with said vertical axis and turnable with said supporting body so that any desired portion of said needle ring can be turned by a first operator into a selected working position by eflecting turning movement of said supporting body; and operator supporting means for a second operator mounted on said stationary support for movement thereon, said operator supporting means including a wheel means adapted to roll on a horizontal surface surrounding said supporting body, said operator supporting means attached to said turnable supporting body so that said operator supporting means turns with said supporting body whereby the second operator remains opposite the same portion of said needle ring when the first operator turns said supporting body to work on different portions of said needle ring.

7. In a circular linking machine, an operator supporting arrangement comprising, in combination, a stationary support; a supporting body mounted on said stationary support for turning movement about a vertical axis; a circular needle ring concentric with said vertical axis and turnable with said supporting body so that any desired portion of said needle ring can be turned by a first operator into a selected working position by eflecting turning movement of said supporting body; operator supporting means for a second operator, said operator supporting means including a connecting portion connected to said support for turning movement relative to the same, a support portion for the second operator secured to said connecting portion, and a wheel means secured to said connecting portion and adapted to roll on a horizontal surface surrounding said supporting body; and means for coupling said connecting portion to said turnable supporting body so that said operator supporting means turns with said supporting body whereby the second operator remains opposite the same portion of said needle ring when the first operator turns said supporting body to work on dilferent portions of said needle ring.

8. An arrangement as set forth in claim 7, wherein said supporting body is formed with circular track means concentric vn'th said vertical axis; and wherein the connecting portion of said operator supporting means includes a pair of arms extending at an angle to each other and having free ends guided along said track means.

9. An arrangement as set forth in claim 8, wherein said free ends of said arms are guided along said track means through an angle smaller than 360.

10. In a circular linking machine, an operator supporting arrangement, comprising, in combination, a stationary support; a supporting body mounted on said stationary support for turning movement about a vertical axis; a circular needle ring concentric with said vertical axis and turnable with said supporting body so that any desired portion of said needle ring can be turned by a first operator into a selected working position by effecting turning movement of said supporting body; operator supporting means for a second operator, said operator supporting means including a circular supporting ring mounted on said stationary support for turning movement about said vertical axis, said supporting ring concentric with said supporting body, a connecting portion fixedly secured to said supporting ring for turning movement with the same, a seat portion for the second operator secured to said connecting portion; and means for connecting said operator supporting means to said turnable supporting body so that said operator supporting means turns with said supporting body whereby the second operator remains opposite the same portion of said needle ring when the first operator turns said supporting body to work on different portions of said needle ring.

11. An arrangement as set forth in claim 10, wherein said operator supporting means includes a roller turnably mounted on said circular supporting ring diametrically opposite said supporting portion; and wherein said stationary support includes a fixed annular member on which said roller rolls.

12. In a circular linking machine, an operator supporting arrangement comprising, in combination, a stationary base; a supporting column mounted on said stationary base for turning movement about a vertical axis, said column having a lower end; a circular needle ring concentric with said vertical axis and mounted on top of said supporting column movable relative thereto but turnable with the same; a circular flange connected with the lower end of said column and having a circular top surface so that any desired portion of said needle ring can be turned by a first operator into a selected working position by turning said flange and said supporting column; a first stationary ring surrounding said flange and secured to said base, said first ring having a top surface slightly lower than the top surface of said flange; a second stationary ring secured to said base below and spaced from said first stationary ring whereby said first and said second ring define an annular gap therebetween; operator supporting means for a second operator including a supporting ring turnably mounted on and concentric with said second stationary ring, a connecting portion secured to said supporting ring and projecting in radial direction through said gap, and seat means secured to said connecting portion; and coupling means having a casing secured to said connecting portion, a coupling member reciprocably received in said casing, said coupling member having a friction surface and movable between an inoperative position and a coupling position in which said friction surface engages the top surface of said flange,

and foot pedal means adapted to be operated by said second operator and connected to said casing for effecting movement of said coupling member from said coupling position so that said operator supporting means is free to turn with said supporting column whereby the second operator remains opposite the same portion of said needle ring when the first operator turns said supporting column to Work on difiterent portions of said needle ring.

13. An arrangement as set forth in claim 12, wherein said coupling means further comprises a spring urging said coupling member into said coupling position, and wherein said coupling member has a flange projecting from said casing, said foot pedal means including lever means pivotally mounted on said casing and connected to the flange of said coupling member for moving the coupling member to said inoperative position.

14. In a circular linking machine, an operator supporting arrangement comprising, in combination, a stationary support; a supporting body mounted on said stationary support for turning movement about a vertical 16 axis; circular tool means concentric with said vertical axis and turnable with said supporting body so that any desired portion of said tool means can be turned by a first operator into a selected working position by efiecting turning movement of said supporting body; and operator supporting means for a second operator, said operator supporting means attached to said turnable supporting body and coaxially rotatable thereab-out so that said operator supporting means may be turned by the second operator to follow the turning movement of said tool means eftected by thefirst operator.

References Cited in the tile of this patent UNITED STATES PATENTS 

